Active matrix type display apparatus and a driving device of a load

Abstract

An active matrix type display device having a plurality of pixel circuits ( 1 ) arranged in a matrix shape. The pixel circuit has: a display device (EL); a drive transistor (M 1 ) of a first conductivity type for controlling a current flowing in the display device; a capacitor (C 1 ) provided at a control electrode of the drive transistor; and a switch (M 2 a, M 2 b ), connected to the control electrode of the drive transistor, for holding a drive control signal at the capacitor. The switch includes a switching transistor (M 2 a ) of the first conductivity type and a switching transistor (M 2 b ) of a second conductivity type in which one main electrode of the switching transistor of the first conductivity type and one main electrode of the switching transistor of the second conductivity type are connected serially. One of the other main electrode of the switching transistor of the first conductivity type and the other main electrode of the switching transistor of the second conductivity type is connected to the control electrode of the drive transistor.

1 .- 15 . (canceled) 
     
     
         16 . An active matrix type display apparatus, comprising:
 a plurality of pixel circuits arranged in a matrix; and   a plurality of wirings for supplying a row scan signal,   wherein the pixel circuit comprises:   a display element;   a drive transistor of a first conductivity type for controlling a current flowing in the display element;   a capacitor connected to a control electrode of the drive transistor, for holding a voltage of the control electrode of the drive transistor; and   a switch arranged between the control electrode of the drive transistor and one of main electrodes of the drive transistor,   wherein the switch includes a plurality of transistors including a first conductivity transistor,   the plurality of transistors are serially connected mutually, and have control electrodes connected respectively to the wirings for supplying the row scan signal, and   one of main electrodes of the first conductivity transistor is connected to the control electrode of the drive transistor.   
     
     
         17 . An apparatus according to  claim 16 , wherein
 the first conductivity type is p-type.   
     
     
         18 . An apparatus according to  claim 16 , wherein
 the switch includes a second conductivity transistor, the second conductivity type is different from the first conductivity type.   
     
     
         19 . An apparatus according to  claim 16 , wherein
 the display element is an organic EL element.